Intel E5640 AT80614005466AA User Manual

Product codes

AT80614005466AA

Intel

Xeon

Processor 5600 Series Datasheet Volume 1

Electrical Specifications

Clock multiplying within the processor is provided by the internal phase locked loop
(PLL), which requires a constant frequency BCLK_DP, BCLK_DN input, with exceptions
for spread spectrum clocking. DC specifications for the BCLK_DP, BCLK_DN inputs are
provided in

Table 2-14

and AC specifications in

Table 2-22

. These specifications must

be met while also meeting the associated signal quality specifications outlined in

Section 3

2.1.6

Test Access Port (TAP) Signals

Due to the voltage levels supported by other components in the Test Access Port (TAP)
logic, it is recommended that the processor(s) be first in the TAP chain and followed by
any other components within the system. A translation buffer should be used to
connect to the rest of the chain unless one of the other components is capable of
accepting an input of the appropriate voltage. Similar considerations must be made for
TCK, TDO, TMS, and TRST#. Two copies of each signal may be required with each
driving a different voltage level.

Processor TAP signal DC specifications can be found in

Table 2-18

. AC specifications are

located in

Table 2-27

Note:

While TDI, TMS and TRST# do not include On-Die Termination (ODT), these signals are

weakly pulled-up via a 1-5 kΩ resistor to V

Note:

While TCK does not include ODT, this signal is weakly pulled-down via a

1-5 kΩ resistor to V

2.1.7